/Engine/Source/Runtime/MeshDescription/Public/MeshElementArray.h
This defines the container used to hold mesh elements. Its important properties are that it acts as an associative container (i.e. an element can be obtained from a given index), and that insert/delete/find are cheap. The current implementation is as aTSparseArray, but we abstract it so that this can be changed later if required, e.g. aTMapmight be desirable if we wished to maintain unique indices for the lifetime of the container.
template<typename ElementType> class TMeshElementArrayBase
TSparseArray< E...
Container
The actual container, represented by a sparse array